Speaker and manufacturing method of the same

(19)

(11)

EP 1 643 799 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	10.03.2010 Bulletin 2010/10

(43)	Date of publication A2:
	05.04.2006 Bulletin 2006/14

(21)	Application number: 05255816.0

(22)	Date of filing: 21.09.2005

(51)

International Patent Classification (IPC):

H04R 9/06^(2006.01)

H04R 31/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK YU

(30)

Priority:

29.09.2004 JP 2004284934
30.09.2004 JP 2004286484

(71)	Applicant: Alpine Electronics, Inc.
	Tokyo (JP)

(72)	Inventor:
	Shimamura, Naoki, c/o Alpine Electronics, Inc. Iwaki-city Fukushima (JP)

(74)	Representative: Kensett, John Hinton
	Saunders & Dolleymore LLP 9 Rickmansworth Road Watford WD18 0JU Watford WD18 0JU (GB)

(54)	Speaker and manufacturing method of the same

(57) A speaker includes a diaphragm having a principal vibration part and annular internal and external supports for supporting the principal vibration part, a large-diameter voice coil unit mounted at the outer edge of the principal vibration part, a small-diameter voice coil unit mounted at the inner edge of the principal vibration part, and a yoke integrated with the diaphragm. Positioning members fixed to the diaphragm as well as retained to a predetermined site of the yoke are provided for restricting the positions of the diaphragm relative to the yoke in a radial direction and a front-back direction perpendicular to the radial direction so that the large-diameter voice coil unit and the small-diameter voice coil unit are arranged within magnetic gaps in a magnetic circuit, respectively.

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